mirror-flip: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/mirror-flip - from package: ladr4-apps

You may install the required package with command apt-get install {package}

Error in other languages:
mirror-flip: bevel nie gevind nie
mirror-flip: comandă negăsită
mirror-flip: comando não encontrado
mirror-flip: commande introuvable
mirror-flip: command not found
mirror-flip: käsku ei ole
mirror-flip: không tìm thấy lệnh
mirror-flip: komanda nerasta
mirror-flip: Kommando nicht gefunden.
mirror-flip: kommandot finns inte
mirror-flip: komut yok
mirror-flip: nie znaleziono polecenia
mirror-flip: níor aimsíodh an t-ordú
mirror-flip: no se encontró la orden
mirror-flip: no s'ha trobat l'ordre
mirror-flip: opdracht niet gevonden
mirror-flip: parancs nem található
mirror-flip: perintah tidak ditemukan
mirror-flip: príkaz nenájdený
mirror-flip: příkaz nenalezen
mirror-flip: команда не найдена
mirror-flip: командата не е открита
mirror-flip: 命令找不到
mirror-flip: コマンドが見つかりません